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vp9 [2023/04/02 21:15] beandog [VP9] |
vp9 [2023/04/19 21:54] (current) beandog [ffmpeg] |
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| * [[http://ffmpeg.org/ffmpeg-all.html#libvpx|ffmpeg libvpx documentation]] | * [[http://ffmpeg.org/ffmpeg-all.html#libvpx|ffmpeg libvpx documentation]] | ||
| * [[https://developers.google.com/media/vp9/bitrate-modes|VP9 Bitrate Modes in Detail]] - Google's | * [[https://developers.google.com/media/vp9/bitrate-modes|VP9 Bitrate Modes in Detail]] - Google's | ||
| - | * [[https://www.texpion.com/2018/07/av1-vs-vp9-vs-avc-h264-vs-hevc-h265-1-lossless.html|AV1 vs VP9 vs AVC (h.264) vs HEVC (h.265): Part I - Lossless]] - a good read, I like this one | ||
| - | * [[https://github.com/deterenkelt/Nadeshiko/wiki/Pitfalls-in-VP9|Pitfalls in VP9]] - goes in a bit of detail about quality levels | ||
| * [[http://wiki.webmproject.org/vp9/vp9-tips|VP9 Tips - Encoding Modes and Recommended Command Line Options]] - upstream's wiki | * [[http://wiki.webmproject.org/vp9/vp9-tips|VP9 Tips - Encoding Modes and Recommended Command Line Options]] - upstream's wiki | ||
| * [[https://slhck.info/video/2017/02/24/crf-guide.html|CRF Guide (Constant Rate Factor in x264, x265 and libvpx)]] | * [[https://slhck.info/video/2017/02/24/crf-guide.html|CRF Guide (Constant Rate Factor in x264, x265 and libvpx)]] | ||
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| By default, ''vpxenc'' will use 2-pass method for encoding. | By default, ''vpxenc'' will use 2-pass method for encoding. | ||
| - | As far as I can tell, there's no default when using CQ mode. I don't know what variables it's using for default when doing a 1-pass encode. | + | To gain a CRF-type result, use ''--end-usage=cq --cq-level=<arg>'' format, and then a 1-pass encode ''--passes=1'' Using this, ''vpxenc'' uses a default CQ of 32. |
| + | |||
| + | I get different encoding times on multiple runs, even though it's producing the exact same files, so watch out for that. | ||
| + | |||
| ==== HandBrake ==== | ==== HandBrake ==== | ||
| By default, HandBrake uses a CQ of 22. | By default, HandBrake uses a CQ of 22. | ||
| + | |||
| + | HandBrake will only use 2-passes if a bitrate is set as well. | ||
| + | |||
| + | ==== ffmpeg ==== | ||
| + | |||
| + | You can use ''ffmpeg'' to get a deep level of output to see what it's doing, it uses the default CRF of 32: | ||
| + | |||
| + | <code> | ||
| + | ffmpeg -loglevel debug -i sample.y4m -vcodec libvpx-vp9 sample.webm | ||
| + | </code> | ||
| + | |||
| + | Relevant output: | ||
| + | |||
| + | <code> | ||
| + | [libvpx-vp9 @ 0x55a6e613e3c0] VP8E_SET_CPUUSED: 1 | ||
| + | [libvpx-vp9 @ 0x55a6e613e3c0] VP8E_SET_ARNR_MAXFRAMES: 0 | ||
| + | [libvpx-vp9 @ 0x55a6e613e3c0] VP8E_SET_ARNR_STRENGTH: 3 | ||
| + | [libvpx-vp9 @ 0x55a6e613e3c0] VP8E_SET_ARNR_TYPE: 3 | ||
| + | [libvpx-vp9 @ 0x55a6e613e3c0] VP8E_SET_STATIC_THRESHOLD: 0 | ||
| + | [libvpx-vp9 @ 0x55a6e613e3c0] VP8E_SET_CQ_LEVEL: 32 | ||
| + | [libvpx-vp9 @ 0x55a6e613e3c0] VP9E_SET_COLOR_SPACE: 0 | ||
| + | [libvpx-vp9 @ 0x55a6e613e3c0] VP9E_SET_COLOR_RANGE: 0 | ||
| + | [libvpx-vp9 @ 0x55a6e613e3c0] VP9E_SET_TARGET_LEVEL: 255 | ||
| + | </code> | ||
